Custom plastic and rubber injection moulding for industrial, research, viticulture, medical, and defence applications. Small enough to care. Experienced enough to get it right.
Cresta Plastics is a family-owned, contract injection moulder based in Holden Hill, South Australia. We work directly with engineers, procurement teams, and startups — across tooling, materials, design-for-manufacture, and production — from first article through to ongoing supply.
Talk to UsPlastic and rubber components across a range of thermoplastics and engineering polymers. Machines from small shot weights up to 300-tonne clamping force.
Guidance on tooling design and supplier selection. We manage the tooling process on your behalf, work with customer-supplied tooling, and advise on modifications as parts evolve.
We support early-stage development with trial runs, material selection, and first-article production. Useful for startups, research projects, and product development teams who need small quantities before committing to volume.
Metal inserts, over-moulding, and secondary assembly operations. Complex assemblies can be partially or fully completed in-house, reducing handling and lead time.
Material specification is critical — the wrong choice costs everyone time and money. We provide practical guidance on polymer selection based on application requirements, regulatory context, and Australian supply availability.
We service ongoing production orders for customers who need reliable, traceable, Australian-made supply — without the volume minimums that larger moulders impose. We're a practical option when overseas supply chains aren't working for you.
We work across a range of industrial and specialised sectors. Our size is an advantage — we can engage with smaller volumes, niche applications, and developing projects that larger moulders won't touch.
Closures, fittings, handling components, and custom parts for South Australian and national wine producers. Understanding of food-grade and UV requirements.
Low-volume, high-specification components for research institutions, universities, and specialist equipment manufacturers. We engage early in the development process.
Housings, brackets, guards, bushings, spacers, and functional components across manufacturing, infrastructure, and equipment sectors.
Clean, consistent production with traceability requirements. We supply components to medical device manufacturers and dental industry suppliers.
Reliable Australian supply, documented quality systems, and discretion for sensitive projects. We have experience with defence-adjacent and defence contractor requirements.
UV-stable, chemically resistant components for irrigation, spraying, and agricultural equipment. Durable materials suited to outdoor and harsh environments.
Functional interior and underbody components, electrical housings, and specialised parts for automotive and transport applications.
Enclosures, connectors, and housings for electronics manufacturers. We've supplied components to the same customers for over 20 years.
Cresta operates an ISO 9001-aligned Quality Management System. Our QMS is actively developed — not a shelf document — and governs how we manage production, materials, non-conformances, and customer requirements.
For customers in medical, defence, and research sectors, this means documented traceability, controlled processes, and a system you can audit.
Every production run is linked to its material lot. For regulated applications, we maintain supplier certificates and batch records.
We conduct first-article checks before committing to a production run, and monitor key parameters through the cycle.
Problems are recorded, investigated, and actioned. We don't ship parts we're not confident in, and we communicate issues promptly.
We can accommodate specific inspection, packaging, labelling, and documentation requirements on request. Ask us what you need.
Our QMS is a working system — regularly reviewed and updated as the business grows. We take quality seriously because our customers' products depend on it.
We work across a broad range of thermoplastics and rubber compounds. Material selection is application-specific — if you're not sure what's right, talk to us early. We're honest about what will and won't work in Australian supply conditions.
| Material | Common Applications | Notes |
|---|---|---|
| Polypropylene (PP) | Industrial fittings, closures, containers, agricultural | Excellent chemical resistance. Food-grade grades available. |
| Polyethylene (PE / HDPE) | Agricultural, industrial, fluid handling | UV-stabilised grades available. Good low-temperature performance. |
| ABS | Enclosures, housings, automotive interior | Good surface finish. Wide colour range. |
| Nylon (PA6 / PA66) | Mechanical components, gears, bushings, agricultural fittings | High strength and wear resistance. Moisture absorption to be accounted for in design. |
| Acetal (POM) | Precision mechanical parts, gears, valves, rollers | Low friction, dimensional stability. Good food-grade option. |
| Polycarbonate (PC) | Optical, transparent covers, medical | High impact strength. Process-sensitive — tooling design matters. |
| TPE / TPU | Seals, grips, flexible components, over-moulding | Rubber-like flexibility with thermoplastic processing. Good for two-shot or over-moulding. |
| Rubber | Seals, gaskets, vibration damping | Natural and synthetic compounds. Different tooling and process to thermoplastics. |
| Recycled Polymers | Non-critical industrial applications | Available for suitable applications. We'll advise where recycled content is viable. |
We run small batches, trial quantities, and ongoing low-volume production. We're set up for it, and we price it honestly.
No sales layer. When you contact Cresta, you're talking directly to the people making the decisions. Faster answers, fewer misunderstandings.
We'll tell you if your design is going to cause problems before tooling is cut. That kind of early honesty saves significant time and money.
For customers who need reliable, local supply — for IP reasons, sovereign capability, or simply to avoid the headaches of offshore sourcing — we're a practical alternative.
We'll engage from concept through to ongoing production. We're used to working with customers who are still developing their product alongside their production requirements.
If your project isn't a good fit for injection moulding, or for us specifically, we'll tell you that upfront rather than waste your time and ours.
Send us a message with as much detail as you have. We'll come back to you with practical questions and, where we can, an indicative view on feasibility and cost.
If you have drawings, 3D files, or a material specification, attach them — it saves time on both sides.